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hughvane

 
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Member Since: May 18, 2008
Location: Banks Peninsula, New Zealand
Posts: 3,263
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Mac Specs: MacMini 2.4, 4 Gb, OS 10.9 and 10.6; MacBook 2.4, 2 Gb, OS 10.6.8

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It's almost certain to be the CRT display. My eMac too emits a high-pitched tone occasionally, which changes, or fades altogether, according to various display activity. I've simply learned to live with it, the display itself doesn't seem to be affected.
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